One Nation has confirmed it will vote for the Coalition's industrial relations legislation as necessary to stop "union thuggery", increasing the government's chances of passing the bills it used to trigger a double dissolution election.

"Union bosses who have enjoyed a lawless environment have gone on to use the union fees of some of the lowest paid workers to use hookers, buy jewellery and make renovations to their private homes," One Nation senator Malcolm Roberts said.

In a speech to the conservative H.R. Nicholls Society on Saturday, Mr Roberts confirmed the party was "inclined to support" the government's legislation "as it stands" because the bills "promote freedom".

He previously hinted One Nation would support the Australian Building and Construction Commission when the party passed the government's bill to "protect" Victorian Country Fire Authority volunteers from a union enterprise agreement.

He said the government's proposed establishment of a registered organisations commission to regulate unions was necessary to stop "union thuggery".

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The party's official backing announced on the weekend delivers the government four key Senate votes for its Australian Building and Construction Commission and registered organisations bills but leaves it short by five.

Labor employment services spokesperson Ed Husic told ABC on Sunday "we'll have to wait and see" but on the numbers at the moment "it's more likely" that the ABCC bills would pass.

However, the government will still have to negotiate amendments and trade-offs with the rest of the crossbench.

The Nick Xenophon Team, which controls three votes, has detailed a string of demands in return for its support on the bills, while Independent Senator David Leyonhjelm has called for the lifting of a ban on the Adler rapid-fire shotgun in exchange for his vote.

Family First Senator Bob Day's recent resignation following the collapse of his construction company has thrown his vote into uncertainty.

"On a personal level I have told [Employment] Minister [Michaelia] Cash that we must work first on stabilising the industrial relations landscape and then progress to a position where we eventually get the federal government out of the industrial relations arenas.

He said he believed successive governments had "trashed" the idea of competitive federalism "enshrined" in the constitution.

"We need to reclaim our founding document and reinstitute a system where states compete with each other for business."

One Nation has also written to Senator Cash to request the Australian Competition and Consumer Commission investigate narrowing the historic exemption of industrial relations from competition laws.

Senator Roberts confirmed "the industrial relations carve-out and correcting this imbalance is one of our most keen areas of interest".